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Enzymatic treatment on yarn

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention relates to an enzymatic process for treating yarn. The present invention also relates to a combined process of bioscouring and biopolishing with pectinase and cellulase on yarn treatment in one bath, a combined bleach clean up and biopolishing with catalase and cellulase in one bath, and even a combined bleach clean up, biopolishing and dyeing processes in one bath.

Country

Undisclosed

Language

English (United States)

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ENZYMATIC TREATMENT ON YARN

ABSTRACT

The present invention relates to an enzymatic process for treating yarn. The present invention also relates to a combined process of bioscouring and biopolishing with pectinase and cellulase on yarn treatment in one bath, a combined bleach clean up and biopolishing with catalase and cellulase in one bath, and even a combined bleach clean up, biopolishing and dyeing processes in one bath.

BACKGROUND

The processing of a fabric, such as of a cellulosic material, into material ready for garment manufacture involves several steps: spinning of the fiber into a yarn; construction of woven or knit fabric from the yarn; and subsequent preparation, dyeing and finishing operations. The preparation process, which may involve desizing (for woven goods), scouring, bleaching, and bleach clean up by removing excess hydrogen peroxide, produces a fabric suitable for dyeing or finishing.

EP2164943 discloses that the bleach clean up and biopolishing can be conducted simultaneously or sequentially in one bath, and further bleach clean up, biopolishing and dyeing can be conducted in the same bath. By adopting such combined process, a pH adjusting step and temperature adjusting step are avoided; process time is saved/reduced. Furthermore, when dyeing step is combined with bleach clean up and biopolishing in the same treating solution, it makes the process even more efficient.

Fabric preparation process can be applied on yarn in a similar way. After spinning the fiber into a yarn, the yarn is then scoured, bleached, dyed and followed by other finishing steps such as waxing and sizing steps.

EP911441 discloses the process for cellulase treatment on yarn, which can reduce hairiness, decrease the yarn number, improve the evenness of yarn and/ or decrease the dustiness of yarn. EP911441 further discloses that the cellulase treatment step is performed in connection with the dyeing step, by adding enzyme added first, then the dye and there is no rinsing step with water between the steps, which saves time.A. Scouring: The scouring process removes much of the non-cellulosic compounds naturally found in cotton. In addition to the natural non-cellulosic impurities, scouring can remove residual manufacturing introduced materials such as spinning, coning or slashing lubricants. The scouring process employs sodium hydroxide or related causticizing agents such

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as sodium carbonate, potassium hydroxide or mixtures thereof. The treatment is generally at a high temperature, 80°C - 100°C, employing strongly alkaline solutions of the scouring agent, e.g., pH 13-14. Due to the non-specific nature of chemical processes not only are the impurities but the cellulose itself is attacked, leading to damages in strength or other desirable fabric properties. Bioscouring refers to the step of lowering the pH by using enzymes, such as pectinase, pectin lyase, lipase etc for scouring purpose, to remove the non-cellulosic compounds...